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<h2 id="&#x8BA4;&#x8BC6;-tree-shaking">&#x8BA4;&#x8BC6; Tree Shaking</h2>
<p>Tree Shaking &#x53EF;&#x4EE5;&#x7528;&#x6765;&#x5254;&#x9664; JavaScript &#x4E2D;&#x7528;&#x4E0D;&#x4E0A;&#x7684;&#x6B7B;&#x4EE3;&#x7801;&#x3002;&#x5B83;&#x4F9D;&#x8D56;&#x9759;&#x6001;&#x7684; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#xFF0C;&#x4F8B;&#x5982;&#x901A;&#x8FC7; <code>import</code> &#x548C; <code>export</code> &#x5BFC;&#x5165;&#x5BFC;&#x51FA;&#x3002;
Tree Shaking &#x6700;&#x5148;&#x5728; Rollup &#x4E2D;&#x51FA;&#x73B0;&#xFF0C;Webpack &#x5728; 2.0 &#x7248;&#x672C;&#x4E2D;&#x5C06;&#x5176;&#x5F15;&#x5165;&#x3002;</p>
<p>&#x4E3A;&#x4E86;&#x66F4;&#x76F4;&#x89C2;&#x7684;&#x7406;&#x89E3;&#x5B83;&#xFF0C;&#x6765;&#x770B;&#x4E00;&#x4E2A;&#x5177;&#x4F53;&#x7684;&#x4F8B;&#x5B50;&#x3002;&#x5047;&#x5982;&#x6709;&#x4E00;&#x4E2A;&#x6587;&#x4EF6; <code>util.js</code> &#x91CC;&#x5B58;&#x653E;&#x4E86;&#x5F88;&#x591A;&#x5DE5;&#x5177;&#x51FD;&#x6570;&#x548C;&#x5E38;&#x91CF;&#xFF0C;&#x5728; <code>main.js</code> &#x4E2D;&#x4F1A;&#x5BFC;&#x5165;&#x548C;&#x4F7F;&#x7528; <code>util.js</code>&#xFF0C;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<p><code>util.js</code> &#x6E90;&#x7801;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">export</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">funcA</span>(<span class="hljs-params"></span>) </span>{
}

<span class="hljs-keyword">export</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">funB</span>(<span class="hljs-params"></span>) </span>{
}
</code></pre>
<p><code>main.js</code> &#x6E90;&#x7801;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">import</span> {funcA} <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;./util.js&apos;</span>;
funcA();
</code></pre>
<p>Tree Shaking &#x540E;&#x7684; <code>util.js</code>&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">export</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">funcA</span>(<span class="hljs-params"></span>) </span>{
}
</code></pre>
<p>&#x7531;&#x4E8E;&#x53EA;&#x7528;&#x5230;&#x4E86; <code>util.js</code> &#x4E2D;&#x7684; <code>funcA</code>&#xFF0C;&#x6240;&#x4EE5;&#x5269;&#x4E0B;&#x7684;&#x90FD;&#x88AB; Tree Shaking &#x5F53;&#x4F5C;&#x6B7B;&#x4EE3;&#x7801;&#x7ED9;&#x5254;&#x9664;&#x4E86;&#x3002;</p>
<p>&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x662F;&#x8981;&#x8BA9; Tree Shaking &#x6B63;&#x5E38;&#x5DE5;&#x4F5C;&#x7684;&#x524D;&#x63D0;&#x662F;&#x4EA4;&#x7ED9; Webpack &#x7684; JavaScript &#x4EE3;&#x7801;&#x5FC5;&#x987B;&#x662F;&#x91C7;&#x7528; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#x7684;&#xFF0C;
&#x56E0;&#x4E3A; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#x662F;&#x9759;&#x6001;&#x7684;&#xFF08;&#x5BFC;&#x5165;&#x5BFC;&#x51FA;&#x8BED;&#x53E5;&#x4E2D;&#x7684;&#x8DEF;&#x5F84;&#x5FC5;&#x987B;&#x662F;&#x9759;&#x6001;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x800C;&#x4E14;&#x4E0D;&#x80FD;&#x653E;&#x5165;&#x5176;&#x5B83;&#x4EE3;&#x7801;&#x5757;&#x4E2D;&#xFF09;&#xFF0C;&#x8FD9;&#x8BA9; Webpack &#x53EF;&#x4EE5;&#x7B80;&#x5355;&#x7684;&#x5206;&#x6790;&#x51FA;&#x54EA;&#x4E9B; <code>export</code> &#x7684;&#x88AB; <code>import</code> &#x8FC7;&#x4E86;&#x3002;
&#x5982;&#x679C;&#x4F60;&#x91C7;&#x7528; ES5 &#x4E2D;&#x7684;&#x6A21;&#x5757;&#x5316;&#xFF0C;&#x4F8B;&#x5982; <code>module.export={...}</code>&#x3001;<code>require(x+y)</code>&#x3001;<code>if(x){require(&apos;./util&apos;)}</code>&#xFF0C;Webpack &#x65E0;&#x6CD5;&#x5206;&#x6790;&#x51FA;&#x54EA;&#x4E9B;&#x4EE3;&#x7801;&#x53EF;&#x4EE5;&#x5254;&#x9664;&#x3002;</p>
<h2 id="&#x63A5;&#x5165;-tree-shaking">&#x63A5;&#x5165; Tree Shaking</h2>
<p>&#x4E0A;&#x9762;&#x8BB2;&#x4E86; Tree Shaking &#x662F;&#x505A;&#x4EC0;&#x4E48;&#x7684;&#xFF0C;&#x63A5;&#x4E0B;&#x6765;&#x4E00;&#x6B65;&#x6B65;&#x6559;&#x4F60;&#x5982;&#x4F55;&#x914D;&#x7F6E; Webpack &#x8BA9; Tree Shaking &#x751F;&#x6548;&#x3002;</p>
<p>&#x9996;&#x5148;&#xFF0C;&#x4E3A;&#x4E86;&#x628A;&#x91C7;&#x7528; ES6 &#x6A21;&#x5757;&#x5316;&#x7684;&#x4EE3;&#x7801;&#x4EA4;&#x7ED9; Webpack&#xFF0C;&#x9700;&#x8981;&#x914D;&#x7F6E; Babel &#x8BA9;&#x5176;&#x4FDD;&#x7559; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x53E5;&#xFF0C;&#x4FEE;&#x6539; <code>.babelrc</code> &#x6587;&#x4EF6;&#x4E3A;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-json">{
  <span class="hljs-string">&quot;presets&quot;</span>: [
    [
      <span class="hljs-string">&quot;env&quot;</span>,
      {
        <span class="hljs-string">&quot;modules&quot;</span>: <span class="hljs-literal">false</span>
      }
    ]
  ]
}
</code></pre>
<p>&#x5176;&#x4E2D; <code>&quot;modules&quot;: false</code> &#x7684;&#x542B;&#x4E49;&#x662F;&#x5173;&#x95ED; Babel &#x7684;&#x6A21;&#x5757;&#x8F6C;&#x6362;&#x529F;&#x80FD;&#xFF0C;&#x4FDD;&#x7559;&#x539F;&#x672C;&#x7684; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#x3002;</p>
<p>&#x914D;&#x7F6E;&#x597D; Babel &#x540E;&#xFF0C;&#x91CD;&#x65B0;&#x8FD0;&#x884C; Webpack&#xFF0C;&#x5728;&#x542F;&#x52A8; Webpack &#x65F6;&#x5E26;&#x4E0A; <code>--display-used-exports</code> &#x53C2;&#x6570;&#xFF0C;&#x4EE5;&#x65B9;&#x4FBF;&#x8FFD;&#x8E2A; Tree Shaking &#x7684;&#x5DE5;&#x4F5C;&#xFF0C;
&#x8FD9;&#x65F6;&#x4F60;&#x4F1A;&#x53D1;&#x73B0;&#x5728;&#x63A7;&#x5236;&#x53F0;&#x4E2D;&#x8F93;&#x51FA;&#x4E86;&#x5982;&#x4E0B;&#x7684;&#x65E5;&#x5FD7;&#xFF1A;</p>
<pre><code>&gt; webpack --display-used-exports
bundle.js  3.5 kB       0  [emitted]  main
   [0] ./main.js 41 bytes {0} [built]
   [1] ./util.js 511 bytes {0} [built]
       [only some exports used: funcA]
</code></pre><p>&#x5176;&#x4E2D; <code>[only some exports used: funcA]</code> &#x63D0;&#x793A;&#x4E86; <code>util.js</code> &#x53EA;&#x5BFC;&#x51FA;&#x4E86;&#x7528;&#x5230;&#x7684; <code>funcA</code>&#xFF0C;&#x8BF4;&#x660E; Webpack &#x786E;&#x5B9E;&#x6B63;&#x786E;&#x7684;&#x5206;&#x6790;&#x51FA;&#x4E86;&#x5982;&#x4F55;&#x5254;&#x9664;&#x6B7B;&#x4EE3;&#x7801;&#x3002;</p>
<p>&#x4F46;&#x5F53;&#x4F60;&#x6253;&#x5F00; Webpack &#x8F93;&#x51FA;&#x7684; <code>bundle.js</code> &#x6587;&#x4EF6;&#x770B;&#x4E0B;&#x65F6;&#xFF0C;&#x4F60;&#x4F1A;&#x53D1;&#x73B0;&#x7528;&#x4E0D;&#x4E0A;&#x7684;&#x4EE3;&#x7801;&#x8FD8;&#x5728;&#x91CC;&#x9762;&#xFF0C;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-comment">/* harmony export (immutable) */</span>
__webpack_exports__[<span class="hljs-string">&quot;a&quot;</span>] = funcA;

<span class="hljs-comment">/* unused harmony export funB */</span>

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">funcA</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;funcA&apos;</span>);
}

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">funB</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;funcB&apos;</span>);
}
</code></pre>
<p>Webpack &#x53EA;&#x662F;&#x6307;&#x51FA;&#x4E86;&#x54EA;&#x4E9B;&#x51FD;&#x6570;&#x7528;&#x4E0A;&#x4E86;&#x54EA;&#x4E9B;&#x6CA1;&#x7528;&#x4E0A;&#xFF0C;&#x8981;&#x5254;&#x9664;&#x7528;&#x4E0D;&#x4E0A;&#x7684;&#x4EE3;&#x7801;&#x8FD8;&#x5F97;&#x7ECF;&#x8FC7; UglifyJS &#x53BB;&#x5904;&#x7406;&#x4E00;&#x904D;&#x3002;
&#x8981;&#x63A5;&#x5165; UglifyJS &#x4E5F;&#x5F88;&#x7B80;&#x5355;&#xFF0C;&#x4E0D;&#x4EC5;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;<a href="4-8&#x538B;&#x7F29;&#x4EE3;&#x7801;.html">4-8&#x538B;&#x7F29;&#x4EE3;&#x7801;</a>&#x4E2D;&#x4ECB;&#x7ECD;&#x7684;&#x52A0;&#x5165; UglifyJSPlugin &#x53BB;&#x5B9E;&#x73B0;&#xFF0C;
&#x4E5F;&#x53EF;&#x4EE5;&#x7B80;&#x5355;&#x7684;&#x901A;&#x8FC7;&#x5728;&#x542F;&#x52A8; Webpack &#x65F6;&#x5E26;&#x4E0A; <code>--optimize-minimize</code> &#x53C2;&#x6570;&#xFF0C;&#x4E3A;&#x4E86;&#x5FEB;&#x901F;&#x9A8C;&#x8BC1; Tree Shaking &#x6211;&#x4EEC;&#x91C7;&#x7528;&#x8F83;&#x7B80;&#x5355;&#x7684;&#x540E;&#x8005;&#x6765;&#x5B9E;&#x9A8C;&#x4E0B;&#x3002;</p>
<p>&#x901A;&#x8FC7; <code>webpack --display-used-exports --optimize-minimize</code> &#x91CD;&#x542F; Webpack &#x540E;&#xFF0C;&#x6253;&#x5F00;&#x65B0;&#x8F93;&#x51FA;&#x7684; <code>bundle.js</code>&#xFF0C;&#x5185;&#x5BB9;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">r</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&quot;funcA&quot;</span>)
}

t.a = r
</code></pre>
<p>&#x53EF;&#x4EE5;&#x770B;&#x51FA; Tree Shaking &#x786E;&#x5B9E;&#x505A;&#x5230;&#x4E86;&#xFF0C;&#x7528;&#x4E0D;&#x4E0A;&#x7684;&#x4EE3;&#x7801;&#x90FD;&#x88AB;&#x5254;&#x9664;&#x4E86;&#x3002;</p>
<p>&#x5F53;&#x4F60;&#x7684;&#x9879;&#x76EE;&#x4F7F;&#x7528;&#x4E86;&#x5927;&#x91CF;&#x7B2C;&#x4E09;&#x65B9;&#x5E93;&#x65F6;&#xFF0C;&#x4F60;&#x4F1A;&#x53D1;&#x73B0; Tree Shaking &#x4F3C;&#x4E4E;&#x4E0D;&#x751F;&#x6548;&#x4E86;&#xFF0C;&#x539F;&#x56E0;&#x662F;&#x5927;&#x90E8;&#x5206; Npm &#x4E2D;&#x7684;&#x4EE3;&#x7801;&#x90FD;&#x662F;&#x91C7;&#x7528;&#x7684; CommonJS &#x8BED;&#x6CD5;&#xFF0C;
&#x8FD9;&#x5BFC;&#x81F4; Tree Shaking &#x65E0;&#x6CD5;&#x6B63;&#x5E38;&#x5DE5;&#x4F5C;&#x800C;&#x964D;&#x7EA7;&#x5904;&#x7406;&#x3002;
&#x4F46;&#x5E78;&#x8FD0;&#x7684;&#x65F6;&#x6709;&#x4E9B;&#x5E93;&#x8003;&#x8651;&#x5230;&#x4E86;&#x8FD9;&#x70B9;&#xFF0C;&#x8FD9;&#x4E9B;&#x5E93;&#x5728;&#x53D1;&#x5E03;&#x5230; Npm &#x4E0A;&#x65F6;&#x4F1A;&#x540C;&#x65F6;&#x63D0;&#x4F9B;&#x4E24;&#x4EFD;&#x4EE3;&#x7801;&#xFF0C;&#x4E00;&#x4EFD;&#x91C7;&#x7528; CommonJS &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#xFF0C;&#x4E00;&#x4EFD;&#x91C7;&#x7528; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#x3002;
&#x5E76;&#x4E14;&#x5728; <code>package.json</code> &#x6587;&#x4EF6;&#x4E2D;&#x5206;&#x522B;&#x6307;&#x51FA;&#x8FD9;&#x4E24;&#x4EFD;&#x4EE3;&#x7801;&#x7684;&#x5165;&#x53E3;&#x3002;</p>
<p>&#x4EE5; <code>redux</code> &#x5E93;&#x4E3A;&#x4F8B;&#xFF0C;&#x5176;&#x53D1;&#x5E03;&#x5230; Npm &#x4E0A;&#x7684;&#x76EE;&#x5F55;&#x7ED3;&#x6784;&#x4E3A;&#xFF1A;</p>
<pre><code>node_modules/redux
|-- es
|   |-- index.js # &#x91C7;&#x7528; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;
|-- lib
|   |-- index.js # &#x91C7;&#x7528; ES5 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;
|-- package.json
</code></pre><p><code>package.json</code> &#x6587;&#x4EF6;&#x4E2D;&#x6709;&#x4E24;&#x4E2A;&#x5B57;&#x6BB5;&#xFF1A;</p>
<pre><code class="lang-json">{
  <span class="hljs-string">&quot;main&quot;</span>: <span class="hljs-string">&quot;lib/index.js&quot;</span>, <span class="hljs-comment">// &#x6307;&#x660E;&#x91C7;&#x7528; CommonJS &#x6A21;&#x5757;&#x5316;&#x7684;&#x4EE3;&#x7801;&#x5165;&#x53E3;</span>
  <span class="hljs-string">&quot;jsnext:main&quot;</span>: <span class="hljs-string">&quot;es/index.js&quot;</span> <span class="hljs-comment">// &#x6307;&#x660E;&#x91C7;&#x7528; ES6 &#x6A21;&#x5757;&#x5316;&#x7684;&#x4EE3;&#x7801;&#x5165;&#x53E3;</span>
}
</code></pre>
<p>&#x5728;<a href="../2&#x914D;&#x7F6E;/2-4Resolve.html#mainFields">2-4Resolve mainFields</a> &#x4E2D;&#x66FE;&#x4ECB;&#x7ECD;&#x8FC7; <code>mainFields</code> &#x7528;&#x4E8E;&#x914D;&#x7F6E;&#x91C7;&#x7528;&#x54EA;&#x4E2A;&#x5B57;&#x6BB5;&#x4F5C;&#x4E3A;&#x6A21;&#x5757;&#x7684;&#x5165;&#x53E3;&#x63CF;&#x8FF0;&#x3002;
&#x4E3A;&#x4E86;&#x8BA9; Tree Shaking &#x5BF9; <code>redux</code> &#x751F;&#x6548;&#xFF0C;&#x9700;&#x8981;&#x914D;&#x7F6E; Webpack &#x7684;&#x6587;&#x4EF6;&#x5BFB;&#x627E;&#x89C4;&#x5219;&#x4E3A;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-built_in">module</span>.exports = {
  resolve: {
    <span class="hljs-comment">// &#x9488;&#x5BF9; Npm &#x4E2D;&#x7684;&#x7B2C;&#x4E09;&#x65B9;&#x6A21;&#x5757;&#x4F18;&#x5148;&#x91C7;&#x7528; jsnext:main &#x4E2D;&#x6307;&#x5411;&#x7684; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#x7684;&#x6587;&#x4EF6;</span>
    mainFields: [<span class="hljs-string">&apos;jsnext:main&apos;</span>, <span class="hljs-string">&apos;browser&apos;</span>, <span class="hljs-string">&apos;main&apos;</span>]
  },
};
</code></pre>
<p>&#x4EE5;&#x4E0A;&#x914D;&#x7F6E;&#x7684;&#x542B;&#x4E49;&#x662F;&#x4F18;&#x5148;&#x4F7F;&#x7528; <code>jsnext:main</code> &#x4F5C;&#x4E3A;&#x5165;&#x53E3;&#xFF0C;&#x5982;&#x679C;&#x4E0D;&#x5B58;&#x5728; <code>jsnext:main</code> &#x5C31;&#x91C7;&#x7528; <code>browser</code> &#x6216;&#x8005; <code>main</code> &#x4F5C;&#x4E3A;&#x5165;&#x53E3;&#x3002;
&#x867D;&#x7136;&#x5E76;&#x4E0D;&#x662F;&#x6BCF;&#x4E2A; Npm &#x4E2D;&#x7684;&#x7B2C;&#x4E09;&#x65B9;&#x6A21;&#x5757;&#x90FD;&#x4F1A;&#x63D0;&#x4F9B; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x4F46;&#x5BF9;&#x4E8E;&#x63D0;&#x4F9B;&#x4E86;&#x7684;&#x4E0D;&#x80FD;&#x653E;&#x8FC7;&#xFF0C;&#x80FD;&#x4F18;&#x5316;&#x7684;&#x5C31;&#x4F18;&#x5316;&#x3002;</p>
<p>&#x76EE;&#x524D;&#x8D8A;&#x6765;&#x8D8A;&#x591A;&#x7684; Npm &#x4E2D;&#x7684;&#x7B2C;&#x4E09;&#x65B9;&#x6A21;&#x5757;&#x8003;&#x8651;&#x5230;&#x4E86; Tree Shaking&#xFF0C;&#x5E76;&#x5BF9;&#x5176;&#x63D0;&#x4F9B;&#x4E86;&#x652F;&#x6301;&#x3002;
&#x91C7;&#x7528; <code>jsnext:main</code> &#x4F5C;&#x4E3A; ES6 &#x6A21;&#x5757;&#x5316;&#x4EE3;&#x7801;&#x7684;&#x5165;&#x53E3;&#x662F;&#x793E;&#x533A;&#x7684;&#x4E00;&#x4E2A;&#x7EA6;&#x5B9A;&#xFF0C;&#x5047;&#x5982;&#x5C06;&#x6765;&#x4F60;&#x8981;&#x53D1;&#x5E03;&#x4E00;&#x4E2A;&#x5E93;&#x5230; Npm &#x65F6;&#xFF0C;&#x5E0C;&#x671B;&#x4F60;&#x80FD;&#x652F;&#x6301; Tree Shaking&#xFF0C;
&#x4EE5;&#x8BA9; Tree Shaking &#x53D1;&#x6325;&#x66F4;&#x5927;&#x7684;&#x4F18;&#x5316;&#x6548;&#x679C;&#xFF0C;&#x8BA9;&#x66F4;&#x591A;&#x7684;&#x4EBA;&#x4E3A;&#x6B64;&#x53D7;&#x76CA;&#x3002;</p>
<blockquote>
<p>&#x672C;&#x5B9E;&#x4F8B;<a href="http://webpack.wuhaolin.cn/4-10&#x4F7F;&#x7528;TreeShaking.zip" target="_blank">&#x63D0;&#x4F9B;&#x9879;&#x76EE;&#x5B8C;&#x6574;&#x4EE3;&#x7801;</a></p>
</blockquote>

                                
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